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U.S. Geothermal Inc. to Start Trading on the Toronto Stock Exchange October 1

BOISE, IDAHO--(Marketwire - Sept. 28, 2007) - U.S. Geothermal Inc. ("U.S. Geothermal") (TSX VENTURE:GTH)(OTCBB:UGTH), a renewable energy development company focused on the production of electricity from geothermal energy, announced today that its common shares will be listed on the Toronto Stock Exchange ("TSX") effective at market opening Monday, October 1, 2007 under its existing trading symbol "GTH". The TSX is the senior equity market in Canada.

The common shares of U.S. Geothermal will cease trading on the TSX Venture Exchange following the market close on Friday, September 28. In addition to the TSX listing, U.S. Geothermal continues to trade on the OTC Bulletin Board in the United States under the symbol "UGTH".

About U.S. Geothermal:

U.S. Geothermal is a renewable energy development company that is in the process of constructing a 13-megawatt geothermal power plant at its Raft River site in south eastern Idaho and is developing the Neal Hot Springs geothermal project in eastern Oregon.

The information provided in this news release may contain forward-looking statements within the definition of the Safe Harbor provisions of the US Private Securities Litigation Reform Act of 1995, including statements regarding potential energy resources and projects, development possibilities for Raft River and Neal Hot Springs. These statements are based on U.S. Geothermal Inc.'s current expectations and beliefs and are subject to a number of risks and uncertainties that can cause actual results to differ materially from those described. Readers are cautioned to review the risk factors identified by the company in its filings with Canadian and US securities agencies. Forward-looking statements are based on management's expectations, beliefs and opinions on the date the statements are made. U.S. Geothermal Inc. assumes no obligation to update forward-looking statements if management's expectations, beliefs, or opinions, or other factors, should change.

The TSX, TSX Venture Exchange and OTC Bulletin Board Exchanges do not accept responsibility for the adequacy of this release.